Sash-balance



(No Model.) 4

R. MGMILLEN.

sAsH BALANCE.

No..542,025. PatentedJuly 2,1895.

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Nrrn;A raras ROBERT MCMILLEN, OF PITTSBURG, PENNSYLVANIA.

SASH-BALANCE.

SPECIFICATION forming part oi Letters Patent No. 542,025, dated July 2, 1895.

Application led July 21,1894. Serial No. 518,236. .(No model.)

To a/ZZ whom it may concern:

Be it known that LROBERT McMILLnN, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in a Sash Balance and Lock Combined; and I do hereby declare the following to bea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part ot' this specification.

My invention relates to an improved spring sash-balance; and it consists in certain details of construction and combination of parts, as will be fully described hereinafter.

In the accompanying drawings, Figure 1 is a side sectional elevation of my improved sash balance and lock, together with a means for moving the toothed wheel back, whereby the sash may be removed. Fig. 2 is a side elevation of the same, partly broken away to show the altered position of the parts when the toothed wheel is in a position to remove the sash. Fig. 3 is a plan view of the balance. Fig. 4 is a side elevation of the balance for the other side of the sash, showing the same provided with a locking device, said view being shown partly in section. Fig. 5 is a face view of a portion of the same.

To construct a sash balance and lock in accordance with my invention, I provide a front plate 1 of a suitable size and form, and arrange an integral lug 2 near the base and an opening at the front, through which the toothed wheel4 operates. Pivoted to thislug 2, at either side of the same, are two sections of a frame 3, between which a toothed wheel 4 :is made to operate. This toothed wheel 4 is formed with an annular recess, in Which a coilspring 5 is arranged, one end of which is attached to a spindle 7, formed integral with one of thesections S, and the other to a projecting portionof the said wheel 4. Arranged in brackets 9, attached to the front plate 1,at either side of the sectional frame 3, is a rotatable key 10, provided with a square opening 11, an eccentric portion 16, and a cam 12. This key 10 is adapted to operate a pivoted v hook 13, having a'projection 14 for locking the wheel 4, and also by means of the cam 12 move/the sectional'frame 3 about its pivotal point 6 for the purpose of disengaging the toothed wheel 4 from itsrack 17 when it is desired to remove the sash 1S from the window-frame.

In operation this balance, as described, is mortised into the window-frame and the edges ofthe sash 18 fitted with a rack 17, constructedol" a thin strip ot' met-al bent to form teeth, as shown atv Fig. 1 on the drawings. The spring 5 is wound to the proper tension, which when the teeth ofthe wheel 4 are in mesh with those of the rack 17 places an upward lift on the sash to balance the same. To lock the sash 18, the key 10 is titted with a bar 30, passed through the opening 11 and frame ot' the window and having attached to its outer end a small lever 31. By partly turning this lever 8l the eccentric 16 moves down, carrying the hook with itwandnentering the projecting portion 14 between the teeth otl the wheel 4, thereby locking the same to prevent turning. If it is desired to remove the sash from the window-frame for the purpose of cleaning,

.the key is further turned and the cam operating in the openings 22, formed in each of the sections ot' the frame 3, moves the same about its pivotal point 6, carrying the toothed. wheel 4 with it and releasing the teeth from mesh with the rack 17, as shown at Fig. 2 on the drawings. It will be noticed that this altered position of the parts will not move the projecting portion 14 of the hooked lever from between the teeth of the wheel 4, thereby holding the tension placed on the spring 5, and at the backward turn ot' the said key the frame will first return to place the wheel in mesh with the rack before disengaging the hook 13' from the Wheel 4.

This sash-balance constructed as described `is only used on large sash where it is necesdrawings.

tioned balance consists in the front plate and side sections 3, formed in two integral sections attached together by means of screws, and of substantially the same form as the frame of the other balance. This second balance is itted with a toothed Whee14 and spring, as before described, and also with a modified form of a lock to prevent the said wheel from turning when it is desired to lock the sash at. any point. This lock consists in a key 25, operating between the arms of a pivoted lever 26, and the said lever provided with a projection 29, adapted to enter between the teeth of the Wheel 4 when the key has been turned, as will be seen by reference to Fig. 4 of the This balance operates in connection with a rack let into the edge of the sash similar to that of the first-described balance.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The herein described sash balance and lock, i

consisting of the frame formed in sections and pivoted to the front plate as described, the toothed Wheel and interior spring arranged in said frame, the key provided with a cam adapted to operate in openings formed in the sectional frame for the purpose of moving the teeth of the Wheel out of mesh with the rack in the sash, and the pivoted hooked lever provided with a means for engaging with the teeth of the Wheel to prevent turning of the same, and the eccentric formed on the said key for operating the saine, as and for the purpose described.

In testimony that I claim the foregoing I hereunto affix my signature this v27th day of September, A. D. 1393.

ROBERT MCMILLEN. [L sl] In presence 0f- M. E. HARRISON, JAS. J. MCAFEE. 

